Bump mini-css-extract-plugin from 1.0.0 to 1.2.0

Bumps [mini-css-extract-plugin](https://github.com/webpack-contrib/mini-css-extract-plugin) from 1.0.0 to 1.2.0.
- [Release notes](https://github.com/webpack-contrib/mini-css-extract-plugin/releases)
- [Changelog](https://github.com/webpack-contrib/mini-css-extract-plugin/blob/master/CHANGELOG.md)
- [Commits](webpack-contrib/mini-css-extract-plugin@v1.0.0...v1.2.0)

Signed-off-by: dependabot-preview[bot] <support@dependabot.com>

package.json

@@ -68,7 +68,7 @@
     "imagemin-webpack-plugin": "^2.4.2",
     "material-design-color": "^2.3.2",
     "material-shadows": "^3.0.1",
-    "mini-css-extract-plugin": "^1.0.0",
+    "mini-css-extract-plugin": "^1.2.0",
     "postcss-inline-svg": "^4.1.0",
     "postcss-loader": "^4.0.4",
     "postcss-svgo": "^4.0.2",